Chonan may refer to: Chōnan, Chiba, a town in Japan Cheonan, a city in South Korea Battle of Chonan, a battle in the city during the Korean War ROKS Cheonan (PCC-772), a South Korean corvette sunk in 2010 Chonan Gang, the Korean stage name of Tsuyoshi Kusanagi, Japanese actor/singer Ryo Chonan (born 1976), Japanese mixed martial artist Chonan languages, Patagonia